math - Calculate 3D vector perpendicular to a plane generated by two vectors -

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I'm new to dealing with 3D, and even ordinary stuff spin around my head Sorry for the newbie question.

Let's say that I have 2 vectors: 

  a (2,5,1) b (1, -13)

These vectors produce "a plane". one and b

How do I get a third vector vertically in 2D using a vector C (A, B)?

>

That is, a vector vertical for a and b is given by (ay * bz - az) * by, az * Bx-ax * bz, ax * by-ay * bx) .


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